topic Re: performance in Operating System - HP-UX

performance

vaman — Thu, 16 Sep 2004 15:45:49 GMT

In hpux 11 .0 What will be your action point , if you found CPU usage is too high

Re: performance

John Poff — Thu, 16 Sep 2004 15:54:07 GMT

Hi,

It all depends on your definition of too high.

JP

Re: performance

Martin Johnson — Thu, 16 Sep 2004 15:58:39 GMT

It is not so much the CPU utilization usage that worries me, it's the run queue length. CPU utilization can be at 100%, but if the run queue is at 0, it is fine. I'm getting the best bang for my buck.

Run queue is the number of jobs that are waiting to use a CPU. That waiting adds to response time, which is a bad thing.

HTH
Marty

Re: performance

Henry Chua — Fri, 17 Sep 2004 00:09:57 GMT

Interesting.. but what is the command that checks the "queue lenght"

Re: performance

Hein van den Heuvel — Fri, 17 Sep 2004 00:19:15 GMT

uptime (as a crude starting point).

ps -ef ... to see which process is collecting cpu.

top to see which process is collecting cpu.

application knowledge/common-sense to understand what that process might be doing.

process coverage analyzer to see where the busy process is burning time (prospect,...)

truss, to see which system calls are involved.

Hein.

Re: performance

Bharat Katkar — Fri, 17 Sep 2004 01:02:03 GMT

HI Vaman,
It doesn't mean that system is performing bad if CPU utilisation is high on the other hand it is good to see them utilised to their capacity but what matters is the run queue as already said by martin.
You can go thr' sar -q output to monitor the same.
As far as performance is concerned find attached the doc which talks about tuning the System for Best Performance and the necessary attributes associated with it.

Hope that helps.
Regards,

Re: performance

Bharat Katkar — Fri, 17 Sep 2004 01:03:26 GMT

Sorry forgot to attach the doc.......here it is!!